Integration Tests
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Integration testing is the type of testing where we verify the functionality of interactions between different components in our application. These tests help us better understand the internal application processes as they give us an insight into how the application flow actually works.
Integration tests in Spring have somewhat more complicated setup than regular Unit tests. We have to load the Application Context or at least a part of it, so we can autowire Spring beans and test the actual functionalities. This makes Integration tests startup noticeably slower than Unit test.
Depending on the service and part of the application we want to test, we differ a few Integration test types. It’s important to understand and determine the goal of the test so we can configure the test properly, add the right dependencies.
Ensures that the Spring application context is loaded without any issues.
Typically uses @SpringBootTest annotation.
Tests the web layer of the application (controllers, filters, etc.).
Uses @WebMvcTest annotation and MockMvc for mocking HTTP requests.
Tests the persistence layer.
Uses @DataJpaTest to configure an in-memory database for testing.
Aside from in-memory database, we can configure Test Containers () and spin our DB instances inside Docker containers. This way we can get more realistic (production-like) Integration tests leading to more robust and error proof testing.
Tests the service layer, often involving mocking of dependencies using tools like Mockito.
Uses @SpringBootTest and @MockBean to replace the real bean with a mocked one in the application context.
These were just some of the basic examples of integration tests in Spring Boot. To have the complete testing suite of your application, Integration tests are a must for making sure that the application processes work as intended and to avoid production deployment avoidable issues.
